Directions?

Hey guys I recently started to paint digitally, and the whole concept art thing is new to me. Coming from a fine art background, with traditional mindset about what a painting should be, I'm still trying to adjust. So here is what I have done in that regard, I'd be really glad if you have any kind of suggestions, critiques and comments. Anything will be helpful!

Maybe try actually finishing something properly? All of these look like you've laid out the basic colours but haven't actually started polishing and rendering the images.
Though these also show a lot of problems with fundamentals like three dimensional form, perspective, anatomy and have muddy colours since almost all the shadows are just bit more grayer and darker than the base colours.